Another way to get potable water from a stream is to use a water filtration device. The one I use is a a Katadyn Hiker model. When assembled, you pump the water through a prefilter in a water source (which gets out all the big stuff), then through a 0.3 micron glassfiber (no cleaning needed) Activated carbon granulate filter which strains out all the bad stuff. (Can you tell what part of that sentence is marketing buzzmumble?) 
The capacity of this model is approximately 1 quart per minute, so generally it takes longer to set up than to fill a bottle. Over the life of the product, the filter is rated for 200 gallons. Shouldn't need another one for this trip. Neither the chemical method or the filter method is foolproof, so the experts recommend using both.
Unfortunately, this filter weighs about a pound. However, if it provides quick and easy water source, and keeps me on the trail and out of the hospital, I'll gladly carry it.
Water filters provide better tasting and better smelling drinking water by removing chlorine and bacterial contaminants. It greatly reduce the risk of rectal cancer, colon cancer, and bladder cancer by removing chlorine and chlorine by products from drinking water. Thanks a lot.
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Having a good quality filter installed underneath a sink is a good way to get rid of and prevent these problems. 3M water filter
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